JP5073496B2 - Conveyor belt wear detection device - Google Patents

Description

  The present invention relates to a conveyor belt wear detection device that detects wear of a conveyor belt in a non-contact manner.

Conventionally, as a means for detecting the wear of a conveyor belt, a wear detection layer of a hue (for example, white rubber) different from the elastic layer of the belt is embedded in the belt, and when the elastic layer is worn, the wear detection layer appears outside. Therefore, there is one that determines wear (see, for example, Patent Document 1).
In addition, there is an ultrasonic thickness meter that determines wear by periodically measuring the thickness when the conveyor belt is stopped.
In addition, a transbonder is embedded in the belt at different depths from the surface, either of which breaks or falls off as the belt wears, so that the belt passes through it. In some cases, it is possible to detect how much the belt is worn by detecting with an antenna unit having a transmission coil and a sense coil disposed near the belt (see, for example, Patent Document 2).
JP 2004-35115 A West German Patent No. 19525326

However, those described in Patent Document 1 and those measured by an ultrasonic thickness meter are difficult to automatically measure the amount of wear, and can only be measured by human means when the conveyor belt is stopped. bad.
In the device described in Patent Document 2, the transbonder must be embedded in a wide range, and the entire device becomes large, and the installation cost is high.

  In view of the above-mentioned problems of the prior art, the present invention can detect the wear amount of a conveyor belt automatically and easily and accurately during operation, and can be implemented simply and inexpensively. An object of the present invention is to provide a conveyor belt wear detection device.

According to the present invention, the above problem is solved as follows.
(1) Rubber magnets magnetized in the thickness direction are embedded in the conveyor belt so as to be inclined with respect to both the traveling direction and the thickness direction, and the magnetic force due to the wear of the rubber magnet accompanying the wear of the conveyor belt. A magnetic sensor for detecting the change in the position is disposed in a fixed portion close to the movement locus of the rubber magnet.

(2) In the above item (1), the initial thickness of the conveyor belt when the wear amount of the conveyor belt is 0 is T, and the change in magnetic force detected by the magnetic sensor during the initial constant speed running of the conveyor belt When the rising time between the starting point and the peak value is L, the wear amount of the conveyor belt is ΔT, and the rising time during constant speed running of the conveyor belt at the time of measurement is L1, ΔT = (L−L1) / L × By calculating T, the calculation control unit for obtaining the wear value is connected to the magnetic sensor.

(3) In the above item (1) or (2), one end of the rubber magnet is brought into contact with the reinforcing material in the conveyor belt, and the other end is exposed on the surface of the conveyor belt. Inclined in the belt.

(4) In any of the above items (1) to (3), a rubber magnet is inserted between the surface from the surface of the conveyor belt to the internal reinforcing material until it reaches the internal reinforcing material. The belt is arranged in a staircase pattern in both the traveling direction of the belt and the thickness direction.

(5) In the above item (4), in the stepped portion of the rubber magnet, a part of each step is superposed in the thickness direction of the conveyor belt with respect to the adjacent step and the traveling direction of the conveyor belt. To do.

(6) In the above item (4) or (5), when T is the initial thickness from the surface of the conveyor belt to the internal reinforcing material, at least T / from the reinforcing material toward the surface of the conveyor belt. In the range of 3, the rubber magnet is stepped.

(7) In any one of the above items (1) to (6), the rubber magnet is a bonded magnet in which magnet powder is mixed and magnetized in the rubber matrix.

According to the present invention, the following effects can be achieved.
According to the first aspect of the present invention, the magnetic sensor detects a change in the magnetic force of the rubber embedded in the conveyor belt, and based on the change, detects that the conveyor belt is worn together with the rubber magnet. During the operation of the conveyor belt, the wear of the conveyor belt can be automatically detected in a non-contact manner, and the rubber magnet can follow the deformation of the conveyor belt, so that the belt deformation can be inhibited, The rubber magnet can be prevented from being broken or dropped off.
In addition, the rubber magnet is embedded in an inclined state, and wear from the outer end can be detected linearly, and the wear amount can be accurately detected with only one rubber magnet. The structure is simple and can be implemented at low cost.

  According to the second aspect of the present invention, the amount of wear can be accurately determined by the arithmetic control unit from the time difference between the starting point of the change in magnetic force during constant speed running of the conveyor belt and the peak value during measurement. .

  According to the third aspect of the present invention, it is possible to detect wear in the entire range from the surface of the conveyor belt to the reinforcing material.

  According to the fourth aspect of the present invention, the rubber magnets are moved in the direction of travel and the thickness direction of the conveyor belt from the middle from the surface of the conveyor belt to the internal reinforcing material to the internal reinforcing material. Therefore, the starting point of the change in magnetic force, which is difficult to detect by the magnetic sensor, can be detected digitally and the detection accuracy can be improved.

  According to the invention described in claim 5, in the stepped portion of the rubber magnet, a part of each step is superposed in the thickness direction of the conveyor belt. A change in magnetic force can be accurately detected without interruption.

  According to the invention described in claim 6, when the initial thickness from the surface of the conveyor belt to the internal reinforcing material is T, at least T / 3 from the reinforcing material to the surface of the conveyor belt, Since the rubber magnet is stepped, the belt life at the end of wear can be accurately detected.

  According to the seventh aspect of the invention, since the rubber magnet is a bonded magnet in which magnet powder is mixed and magnetized in the rubber matrix, a thin rubber magnet rich in flexibility to follow the belt can be formed. In addition, a rubber magnet having high durability can be obtained.

It is a side view of the unloading side edge part of a belt conveyor provided with the 1st Embodiment of this invention. It is an expanded sectional view of the II part of FIG. FIG. 3 is an enlarged view taken along line III-III in FIG. 1. It is a block diagram of a control apparatus. It is an output waveform diagram from a magnetic sensor. It is an expanded sectional view of the same part as FIG. 2 in a belt conveyor provided with the 2nd Embodiment of this invention.

Explanation of symbols

(1) Pulley
(2) Conveyor belt
(3) Rubber magnet
(4) Magnetic sensor
(5) Reinforcement material
(6) Scraper
(7) Width direction guide
(8) Thickness direction guide
(9) Transmitter
(10) On-site calculation control unit
(11) Receiver
(12) Output terminal
(13) Central control unit

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view of an unloading side end portion of a belt conveyor including the first embodiment of the present invention, FIG. 2 is an enlarged vertical side view of a portion II in FIG. 1, and FIG. It is an III line enlarged view.

  The wear detector is disposed near the rubber magnet (3) embedded on the surface side of the conveyor belt (2) wound around the pulley (1) and the place through which the conveyor belt (2) passes. And a magnetic sensor (4) for detecting the magnetic force from the magnet (3).

  The rubber magnet (3) is composed of a plate-like body magnetized in the thickness direction, and is applied to the conveyor belt (2) in both the traveling direction (arrow A direction in FIGS. 1 and 2) and the thickness direction. It is buried with an inclination. As shown in FIG. 2, the rubber magnet (3) has a base end (3a) in contact with the reinforcing material (5) and a front end (3b) exposed on the surface of the conveyor belt (2). As shown in FIG. 3, it is embed | buried over the whole width direction of the conveyor belt (2).

  As the rubber magnet (3), a magnet obtained by magnetizing a bonded magnet formed by dispersing and mixing magnet powder in a rubber matrix into a sheet shape in the thickness direction is preferably used. Such a bonded magnet can be formed thin, but also has high flexibility and can easily follow the deformation of the conveyor belt (2).

  The magnet powder is generally ferrite, but a strong magnetic force can be imparted by using a rare earth magnet such as neodymium iron boron or samarium iron nitrogen, or an alco magnet.

  The magnetic sensor (4) can be a gauss meter, a loop coil or the like, and is arranged as close as possible to the passing position of the rubber magnet (3). The mounting position of the magnetic sensor (4) is preferably on the return side of the conveyor belt (2) as shown in FIGS. Thereby, the conveyed product conveyed with the conveyor belt (2) can be detected in the clean location after being scraped off by the scraper (6).

  As shown in FIG. 3, a width direction guide (7) for restricting the position in the width direction of the conveyor belt (2) passing therethrough is provided near the magnetic sensor (4), and the magnetic sensor (4 A thickness direction guide (8) for keeping the relationship between the conveyor belt (2) and the magnetic sensor (4) constant is provided on the opposite side of ().

FIG. 4 is an example of a control device for the wear detection device of the conveyor belt (2).
As shown in the figure, the control device receives a detection signal from the magnetic sensor (4), calculates the degree of wear of the belt and transmits it from the transmitter (9), The transmitted signal is received by the receiver (11), the calculation result is output to the output terminal (12), and an alarm is issued when the degree of wear exceeds a predetermined threshold, or the belt conveyor (2) And a central control unit (13) for performing necessary processing such as stopping the operation of the system.

Next, the operation of the wear detection device of this embodiment will be described.
FIG. 5 shows an example of an output waveform from the magnetic sensor (4).
The conveyor belt (2) travels in the direction of the arrow (A) in FIG. 2, and when the rubber magnet (3) passes a position facing the magnetic sensor (4), a signal accompanying a change in magnetic force is transmitted to the magnetic sensor (4). Is output from. Since the wear of the conveyor belt (2) starts from the surface side used for conveyance, the rubber magnet (3) is shaved from the front end (3b) on the surface side.

  In the initial state when the amount of wear of the conveyor belt (2) is 0, the base end (3a) where the rubber magnet (3) contacts the reinforcing material (5) passes through the position facing the magnetic sensor (4). The detection output (≈0) is taken as the starting point (P0), and the detection output of the end face exposed from the tip of the rubber magnet (3), that is, the end face exposed on the surface of the conveyor belt (2), peaks from this point. An initial output waveform (Q) signal having a value (P) is output from the magnetic sensor (4). The time from the starting point (P0) of the output waveform (Q) to the peak value (P) is defined as (L). This time (L) is measured by a timer (not shown) built in the field calculation control unit (10) (or the central control unit (13)).

If the conveyor belt (2) is worn down to the part (2a) indicated by the two-dot chain line in FIG. 2, the rubber magnet (3) is also scraped to the part (3c) indicated by the two-dot chain line. A signal of an output waveform (Q1) in which the detection output of the end face exposed on the surface of (2) indicates the peak value (P1) is output from the magnetic sensor (4). The time from the starting point (P0) of the output waveform (Q1) to the peak value (P1) is defined as (L1).
When the initial thickness on the surface side (from the reinforcing material (5) to the surface) of the conveyor belt (2) is T and the wear value is ΔT, ΔT = (L−L1) / L × T. The amount of wear can be obtained by calculating this in the field calculation control unit (10).

  As described above, in the wear detection device according to the present embodiment, the rubber magnet (3) is embedded in an inclined manner with respect to both the traveling direction and the thickness direction of the conveyor belt, thereby changing the magnetic force waveform. By reading, it is possible to accurately detect the amount of wear with only one rubber magnet (3), and the configuration is simple and inexpensive.

FIG. 6 is an enlarged vertical side view of the same part as in FIG. 2 in the belt conveyor provided with the second embodiment of the present invention. Note that the same or similar members as those in the first embodiment are illustrated with the same reference numerals, and detailed descriptions thereof are omitted.
In this example, the rubber magnet (3) is moved from the reinforcing material (5) in the conveyor belt (2) toward the surface of the conveyor belt (2) at least in the range of T / 3, and the traveling direction and thickness of the conveyor belt. Are arranged so as to form steps (3d), (3e), and (3f) in both directions.
In the portion where the rubber magnet (3) is shaped like a staircase (3d) (3e) (3f), a part of each step is superposed in the thickness direction of the conveyor belt (2). However, it is also possible not to polymerize.
With this configuration, it is possible to accurately detect the magnetic force change starting point (P0), which is difficult to detect by the magnetic sensor (4), and to improve the detection accuracy and wear. The belt life at the end stage can be accurately detected.

The present invention is not limited to the above embodiment.
For example, the degree of wear can be determined from the difference (P−P1) between the peak values (P) and (P1) shown in FIG.

Claims (7)

  A rubber magnet magnetized in the thickness direction is embedded in a conveyor belt so as to be inclined with respect to both the traveling direction and the thickness direction, and the change in magnetic force due to the wear of the rubber magnet accompanying the wear of the conveyor belt. A conveyor belt wear detecting device, wherein a magnetic sensor to be detected is disposed in a fixed portion close to a movement locus of the rubber magnet.   The initial thickness of the conveyor belt when the wear amount of the conveyor belt is 0 is T, and the rising time between the starting point of the change in magnetic force detected by the magnetic sensor and the peak value during the initial constant speed running of the conveyor belt Is calculated by calculating ΔT = (L−L1) / L × T, where L is the wear amount of the conveyor belt, ΔT, and L1 is the rise time of the conveyor belt during constant speed travel at the time of measurement. The apparatus for detecting wear of a conveyor belt according to claim 1, wherein the operation control unit to be obtained is connected to a magnetic sensor.   The rubber magnet is embedded in an inclined manner on the conveyor belt such that one end of the rubber magnet is brought into contact with the reinforcing material in the conveyor belt and the other end is exposed on the surface of the conveyor belt. The conveyor belt wear detection device as described.   From the middle from the surface of the conveyor belt to the internal reinforcing material to the internal reinforcing material, the rubber magnets are stepped in both the direction of travel and the thickness of the conveyor belt. The conveyor belt wear detection device according to any one of claims 1 to 3. 5. The part according to claim 4, wherein in the stepped portion of the rubber magnet, a part of each step is superposed in the thickness direction of the conveyor belt with respect to the adjacent step and the traveling direction of the conveyor belt. Conveyor belt wear detection device.   When the initial thickness from the surface of the conveyor belt to the internal reinforcing material is T, the rubber magnet is stepped in the range of at least T / 3 from the reinforcing material to the surface of the conveyor belt. Item 6. The conveyor belt wear detection device according to Item 4 or 5.   The apparatus for detecting wear of a conveyor belt according to any one of claims 1 to 6, wherein the rubber magnet is a bonded magnet in which magnet powder is mixed and magnetized in a rubber matrix.

Images